Wear lining



y 1 Hfmz ET AL 2,885,156

WEAR LINING Filed Aug. 27, 1954K 2 Sheets-Sheet 1 MINIMUM; I

INVENTORS I 5 ATTORNEY May 5, 1959 H. E.'FlTZ ET AL 2,

WEAR LINING Filed Aug. 27, 1954 2 Sheets-Sheet 2 viii ATTORNEY WEARLINING Kenneth E. Fitz, Barberton, Ohio, Robert W. Schulke, Westport,Conn., and Lewis H. Wolfe, Barberton, Ohio, assignors to The Babcock &Wilcox Company, New York, N.Y., a corporation of New Jersey ApplicationAugust 27, 1954, Serial No. 452,548

4 Claims. (Cl. 241-482) This invention relates to grinding machines ofthe type known as ball mills, tube mills, rod mills, or combinationmills, and more particularly to the wear lining for grinding machines ofthis type.

Wear linings for grinding machines of the type referred to are usuallycast or rolled from wear resistant metals and constructed as segments ofa circle for installation internally of the shell of the grindingmachine. The individual pieces or blocks of the lining are either boltedor wedged in the grinding machine, and are sometimes grouted in place bya layer of zinc or cement, or the like, interposed between the innercircumference of the tubular shell of the machine and the back of theliner. Heretofore, the blocks of the liner segments have beenconstructed to a specific size and shape for each difierent size ofpulverizing machine. This has necessitated stocking large numbers ofpatterns for the production of castings and has resulted in uneconomicallining costs.

In accordance with the invention, blocks of relatively small size areconstructed for installation in substantially any of the commercialsizes of the tubular type of grinding machine. The individual blocks areso constructed as to be self-supporting when installed as the segmentsof the liner of a grinding machine. The interlocking effect of theblocks is obtained by the complementary relationship of the sides ofadjoining blocks which are of the general nature of a ball and socketjoint. Pins can be used in the joints between adjoining blocks for moreaccurate fit of a liner ring in a shell. Advantageously, theconstruction is such that relatively few patterns can provide linearcastings which will be usable in substantially all commercial grindingmachines of the tubular shell type.

The various features of novelty which characterize our invention arepointed out with particularity in the claims annexed to and forming apart of this specification. For a better understanding of the invention,its operating advantages and specific objects attained by its use,reference should be had to the accompanying drawings and descriptivematter in which we have illustrated and described a preferred embodimentof the invention.

Of the drawings:

Fig. l is a section of a segment of a tube mill liner constructed andarranged in accordance with the present invention; v

Fig. 2 is a developed partial plan view of the installed relationship ofthe tube mill liner of the invention;

Fig. 3 is a partial plan view of an individual wear block;

Fig. 4 is an exterior view of an access opening, with cover, in theshell of a grinding machine equipped with the wear blocks of theinvention;

Figs. 5 and 6 are section views taken on the lines 5-5 and 6-6,respectively, of Fig. 4; and

Fig. 7 illustrates a modified block construction constructed inaccordance with the present invention.

In the embodiment of the invention illustrated in the drawings theindividual plates or blocks 10 of the wear lining are formed generallyas a rectangle (in plan) with a short side or width 12 having adimension of approximately 6 inches and a long side of length 13 havinga dimension of approximately 12 inches. The invention is not limited tothese dimensions, but this general size is particularly useful forpractical commercial purposes since this size will fit substantially allof the commercial sizes of grinding machines of the type described, andparticularly those between 5 and 12 feet in diameter. The thickness ofthe block 10 can be of any desirable value, but for purposes ofstandardization, it is desirable to use one or two standard thicknesses,such as for example, 1 /2 and 3-inch thick plates or blocks. Theconfiguration of the Wear surface of each block may be as desired. Inthe embodiment shown, the blocks Ill are constructed in two specificconfigurations, one block 10A presenting a fiat wear surface, while theother block 10B presents a ridged wear surface.

It will be apparent the blocks 10 may be installed in any desiredcombination of wear surface configurations, such as for example, withall the surfaces substantially flat or all ridged, or alternately flatand ridged. As shown in Fig. 2, the blocks 10 are installed with twofiat blocks 10A intervening between each of the ridged blocks 10B, toform a specific pattern for the grinding mill lining. Since, ashereinafter described, the blocks are assembled in circumferential rows,with each row self-sustained in the shell of the mill, adjacent rows maybe arranged with the ridged blocks in alignment longitudinally of theshell of the grinding mill, as shown in Fig. 2. Alternately, the rowsmay be displaced circumferentially of the shell so that the ridgedblocks form a spiral of raised wear surface internally of the grindingmill.

The wear liner block 10 of the invention is rectangular in plan, asshown in Fig. 2, with a generally flat bottom 15 having longitudinalpads 16 and 17 extending partially along the long sides thereof as shownin Fig. 1. When in an installed position, the pads 16 and 17 rest on theshell 20 of the grinding mill and extend in a direction parallel to theaxis of the shell. A block 10A having a flat wear surface 21 is shown inFig. 1, while the block 108 has a raised or ridged Wear surface 22;. Thebottom 15 and sides 23, 24 and 26 of both the flat wear surface andraised wear surface blocks are essentially the same, with the raisedsurface 22 cast as a part of the block 10B. In the illustrated example,the flat block 10A is 3 inches in thickness, while the raised surfaceblock 10B is 4 /2 inches in thickness at the peak thereof. The raisedportion is formed by merging curves of 1 /2 inch radius with the peakintermediate the sides 24 and 26 of the block, and extending the fulllength of the block, i.e. the dimension 13.

The short sides 23 of the blocks 10 (dimension 12) are normal to thebottom 15 or base portion of the block, and each side is provided with agrooved central portion 27 extending the full depth of the block. Thesides 24 and 26 of each block (whether the block 10A or 10B) taperupwardly from the base portion 15 for a distance of approximately 2%"(in a 3" thick block). In the embodiment shown, the width of the blockat its base is actually 6% and at the upper end of the tapered sides thewidth is 6". The taper of both sides is increased toward the top of theblock, being of the order of 6 on the side 24 and 915" on the side 26with the upper corner of each side rounded to a radius of /2.

A curved recess 28 is formed in the side 26 as the segment of a cylinderhaving its axis parallel to the plane of the bottom or base portion 15and spaced between the base 15 and the top or wear surface 21 (or 22).In the embodiment shown in Fig. 1, the radiusof the curved recess 28 is'91 with. the center of curvature positioned 1%" from ,the bottomsurface of the pad 17 and outwardly of the outer surface of the side 26.The edges: of thereeess 28 mergeinto the: surface of side 26 withreverse curves, having. a radius of '91 The side 24 is provided with acurvedprotuberance 31 which is formed as a. segment of a cylinder havingthe same (namely 1 radius as that of the recess 28 and having its axisparallel to the base 15. As shown in Fig. 1 the center of curvature isspaced 1%" above the base and is positioned 3 outwardly of the side 24.Merging reverse curves of /2" radius connect the protuberance 31 withthe surface of the side 24;

With adjoining blocks arranged in side by, side relationship and aprotuberance 31. of one block engaging in a recess 28 of an. adjoiningblock, the blocks. can be arranged in a circle, the diameter of which islimited only by the angularity of the tapering sides 24 and26. With theconstruction shown, the blocks can be used to form the wear liner ofsubstantially all commercial sizes of pulverizers of the type described.

The protuberance 31 is provided with a notch 33 extending longitudinallyof the block. Each notch 33 is approximately /2 wide at the tip of theprotuberance and the sides thereof slope inwardly at an angle ofapproximately 60 with respect to the axis ofthe protuberance. As willhereinafter become apparent, the notch 33 will accommodate a. bar or rod34 insertedbetween adjoining blocks to tighten the circumferentialassembly of wear blocks 10 in the pulverizer shell when the internaldiameter of the shell is such as to make this desirable. Ordinarily, theinternal diameter of the shell will be such that the use of at least afew bars will be necessary to lock the blocks 10 in proper positionwithin the shell of the pulverizer.

The majority of the wear blocks of the lining of the present inventionare maintained in position by the interlocking relationship of therecesses and protuberances on circumferentially adjoining blocks, butsince access openings are usually necessaryand desirable in the shell ofthe pulverizing mill, the blocks 10 adjacent such openings, and on thecover plate are bolted in position. Suitable openings are provided inthe blocks 10 to accommodate the bolts. These openings are shown inFigs. 1, 3, 4, 5, and 6, and include a countersunk hole. 35 of squarecross'section adjacent the wear surface of the block, and a hole 36 ofcircular cross-section extending through the base portion 15.

A plan view of an access opening in the shell 20 with its cover plate,is illustrated. in Fig. 2. As shown, the wear blocks on all sides of theopening are bolted to the shell of the pulverizing mill, and in additionall of the wear blocks in the access opening are bolted to the removablecover. In the illustration, the access opening is approximately 18 x 24inches in dimension, with 3 blocks 10 in two adjoining circumferentialrows or a total of 6 blocks attached to the cover plate. As shown inFigs. 4, 5, and 6, the opening 40 in the shell 20 is generallyrectangular with rounded corners, and is provided with a platereinforcement which is welded on the outer surface of the shell so astohave generally the same edge configurationas, and to overlap the edgesof, the opening 40. same configuration as the opening 40, with lengthand width dimensions somewhat less than that of the opening 40 andgreater than the inside dimensions of the plate 42.

The cover plate 41 is provided with a centrally located handle 43 whichis welded thereto, and a pair of spaced bar members '44 which are eachremovably attached to the cover plate by a bolt 45. Each of the boltsare threaded. into a nut 46 welded to' the cover plate Each of the barmembers 44 have suflicient length. so that the end portions of eachengage the exterior sur face. of. the plate 42. When installed in itsoperative The cover plate 41 also has the.

position,. the edges of the cover plate 41. are drawn into contact withthe edge portions of the plate 42 by tightening a nut 47 on each of thebolts 45 and bearing upon the bar member 44. To remove the cover, thenuts 47 are removed from the bolts 45, the plate 41 moved in- Wardly ofthe shell 20,. tilted, and passed through the access opening 40. The barmembers 44 are easily moved to one side of the opening 40 or removedfrom the shell, after the nuts 47 are withdrawn from the bolts 45. a

As shown in Figs. 4, .5, and 6, the wear liner is assembled entirelywith blocks 103, although it will be apparent the liner could be formedentirely of the blocks 10A or any combination of blocks 10A and 103, asdesired. The blocks are assembled in circumferential rows, as though theblocks were not bolted to the shell 20, although the outside edges ofthe blocks 10B adjacent the edges of the opening 40 are cast so as toprovide a clearance between the blocks 10B forming the sides of theremovable liner of the cover plate and the marginal sides of the blocks10 bolted to the shell 20 adjacent the opening 40. The cast edges of theblocks 10B are shown at 50 and 51 in Fig. 5, where the edge 50corresponds with the side 26 and the edge 51 corresponds with the side24 shown in Fig. 1.

When the lining of the present invention is installed in theshell 20 ofthe grinding. mill, the blocks 10 are self-sustaining as long as theball and socket joints therebetween are in engagement. When thecircumference of the shell is such that acircumferential row of blocks,when installed therein, is not a tight fit so that engagement is lostbetween the ball and socket joints, it becomes desirable to insert rods34 between adjoining blocks to increase the circumferential dimension ofthe row of blocks. Depending upon the diameter of the rods, thecircumference of the row of blocks may be increased as-much as two orthree inches, or more, as desired.

While in accordance with the provisions of the statutes we haveillustrated and described herein a preferred embodiment of theinvention, those skilled in the art understand thatchanges may be madein the form of the apparatus disclosed without departing from the spiritof the invention covered by our claims, and that certain featuresof theinvention may sometimes be used to advantage without corresponding useof other features.

What is claimed is:

l. The combination with a grinding mill having a rotatable shell ofcircular cross-section, of a self-supporting wear liner for the internalsurface of said shell, said wear liner comprising a multiplicity ofblocks arranged in at least one circumferential row, and means forinterlocking the blocks in said circumferential row including alongitudinal protuberance formed on the side of one block and engaging alongitudinal recess formed in the side of an adjoining block, saidprotuberance formed as a segment of a cylinder with its axis ofcurvature spaced outwardly of the side of the block on which saidproturberance is formed, said recess formed as a segment of a cylinderwith its axis of curvature spaced outwardly of the side of the block inwhich said recess is formed, said axesbeing substantially equally spacedfrom the bases of said adjoining blocks and in the central portionbetween the wear and base surfaces of said block.

2. A wear block for installation in the rotatable shell of agrindingmill where a circumferential series of said wear blocks form aself-supporting wear liner ring in said shell, each of said wear blocksincluding substantially planar sides with a longitudinally extending andlongitudinally notched protuberance formed on one of said sides of saidblock, saidprotuberance formed as a segment of a cylinder with its axisof curvature spaced outwardly of the side of the block on which saidprotuberance is formed, and a recessformed in the opposite of said sidesof said block as a segment of a cylinder with its axis of curvaturespaced outwardly of the side of the block in which said recess isformed, said axes being substantially equally spaced from the base ofsaid block and the radius of curvature of both said recess and saidprotuberance being the same whereby the adjacent planar sides ofadjoining blocks are spaced on the opposite sides of said protuberanceand recess of the adjoining blocks.

3. The combination with a grinding mill having a rotatable shell ofcircular cross-section, of a self-supporting wear liner for the internalsurface of said shell, said wear liner comprising a multiplicity ofrectangular blocks arranged in at least one circumferential row, meansfor interlocking the blocks in said circumferential row includ' ing alongitudinal protuberance formed on a long side of one block andengaging a longitudinal recess formed in the long side of an adjoiningblock, said protuberance formed as a segment of a cylinder with its axisof curvature spaced outwardly of the side of the block on which saidprotuberance is formed, said recess formed as a segment of a cylinderwith its axis of curvature spaced outwardly of the side of the block inwhich said recess is formed, said axes being substantially equallyspaced from the bases of said adjoining blocks and substantially midwaythe wear and base surfaces of said blocks.

4. The combination of claim 1 wherein said wear liner blocks arerectangular, the short sides of each of said blocks are substantiallynormal to the base thereof and the long sides of each of said blockshaving said protuberance and recess and being convergingly inclined fromsaid base.

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Modern Refractory Practice With Special Reference to the Products ofHarbison-Walker Refractories Company, Pittsburgh, Pennsylvania,copyrighted by H.W.R. Co., 1950, pages 40, 54 and 130, particularlycited.

